#include <stdio.h>
#include <math.h>
double 
mypow(double x, double y)
{
    return pow(x, y);
}

int
main(int argc, char *argv[])
{
    double x, y;
       
    x = 13.0;
    y = 2.4;
    
    printf("%lf", mypow(x, y));
    return 0;
}